I only have one nameserver (ns1)

Yeah, it will if you add the DNS record(AAAA) manually to every DNS.
But my question is:
In the file; /usr/local/hestia/data/templates/dns/default.tpl it contains the settings for all default DNS entries.
Now it’s possible to create your own DNS template just like it’s possible for nginx / php-fpm.

In such a template you can set the variable %ip%
For example:

ID='10' RECORD='www' TYPE='A' PRIORITY='' VALUE='%ip%' SUSPENDED='no' TIME='%time%' DATE='%date%'

Now that’s for IPv4.
Is it possible to have this for IPv6 too?

Like:

ID='10' RECORD='www' TYPE='AAAA' PRIORITY='' VALUE='%ip6%' SUSPENDED='no' TIME='%time%' DATE='%date%'

That way we get it a whole next level.
Thanks SciT for the fast reply!